Rotary cutting device



ROTARY CUTTING DEVICE Filed Sept. 26, 1939 Patented Mar. 17, 1942 sates NT OFFICE 3 Claims.

My invention relates to rotary cutting devices, and its principal object is to provide a device of the character referred to which is adapted for cutting all kinds of sheet material such as paper, cloth, leather and so forth, and more particularly for cutting asbestos sheeting of the kind used in the roofing and siding of buildings. This latter material presents peculiar difliculties due to the fact that it is saturated with asphalt or similarly sticky material and also that it is coated upon one side with a layer of crushed stone or other abrasive material.

An essential feature of my said invention therefore, in order to meet the above requirements, resides in the combination of a pair of co-acting rotary cutters, the upper of which is provided with a relatively obtuse cutting edge, while the lower one has'a very acute cutting edge, the upper cutter being operated in contact with the abrasively coated side of the material while the lower or sharper cutter operates upon the soft, sticky portion of the material.

Another object of my invention is to provide means for continuously cleaning and lubricating the lower and sharp-edged cutter during its operation.

Another object of my invention is to provide a rotary cutting device, the frame of which is so disposed as to permit it to pass easily between the adjacent edges of the cut.

A further object of my said invention is to provide simple and effective means for adjusting the distance between the centers of the co-acting cutters so as to provide for wear of the same and reduction of diameter due to frequent sharpening of the cutting edges.

With these and other objects in view, I will now describe a preferred embodiments of my invention, reference being had to the accompanying drawing, in which- Figure 1 is a side elevation of my improved device.

Figure 2 is a plan view of the same.

Figure 3 is a vertical section taken on line 3-3 of Figure 1.

Figure 4 is a vertical section taken on line 4-4 of Figure 1, and

Figure 5 is an end elevation taken on line 5--5 of Figure 1.

Like characters designate corresponding parts throughout the several views.

In the drawing, I designates the metal stem of the device provided at its upper end with a handle 2 of wood or other suitable material, and having its lower end bifurcated as indicated by lines a, b,

c, to provide a pair of arms 3, 4 upon the extremities of which are mounted the cutters or knives 5, 5, respectively, the said arms being arranged in laterally offset relation as will be seen from Figure 3, so that the working edges of th cutters are brought into proper alignment.

Thus, as shown more clearly in Figure 3, the upper cutter 5, having a relatively obtuse cutting edge 5|, is provided with integral bosses 52 bored to receive the ball bearing 53, the inner race of which is mounted upon a stud I, the said studhaving a reduced portion II which fits tightly in an opening in the arm 3 and is secured'in position by the nut I2. Similarly, the cutter 6, having an acute edge 6|, is provided with integral bosses 62 bored to receive the ball bearing 53, the inner race of which is mounted upon a stud 8, the said stud having a reduced portion 8| which fits tightly in an opening in the arm 4 and is secured in position by the nut 82. It will be-observed that the main body of the'stud I is disposed eccen-' trically in relation to the reduced portion 'Il thereof, so that by rotating it in the opening in the arm 3, the distance between the centers of the co-acting cutters 5 and 6 may be varied, as

before stated.

It will be observed by reference to the sections Figures 3 and 4 that between the arms 3 and 4 th metal is cut away so as to provide a valley, marked V on the drawing, extending in general along the line .'c:c of Figure 1 so that, due to the reduced thickness of the body along this line, the force requisite to propel the cutter along the slit being formed is reduced to a minimum. Below the cutter 6 is a guard member 9 secured to the main body as by screw 9|, this guard serving to support the device as a whole and to protect the edge of the cutter.

In order to prevent accumulation of asphalt or other sticky substance in the material to be operated upon, ther is provided a pad ID or felt or other absorbent material which is held in the lower forked end of a tubular member IOI, the upper end of which is provided with a reservoir I03, soldered to the body as at El and adapted to contain kerosene or other solvent or cleansing liquid and feed it to the pad 10, the rate of feed bemg determined by a knob I04 formed integral with a stem I05 which projects downwards through the reservoir I03 and terminates in 'a needle valve of any conventional construction so well known that it is unnecessary to describe it further.

In cutting roofing material by a device of the present character some difiiculty is found in the fact that the sheet of material assumes an undulatory form, making it difficult to run the cutters with exactness along the desired line. In order to obviat this difficulty I have provided in advance of the cutters 5 and 6 an upper roller l2 having a relatively wide surface and a lower roller l3 having a narrow surface, as shown more clearly in Figure 5 of the drawing. The roller I2 is mounted upon a pin I20 in a swinging arm [2| pivoted at I22 to the frame and pressed downwards by an arcuate spring I23, while the lower roller I3 is carried upon a fixed screw I30 as shown in Figures 1 and 5.

While I have herein described and shown a preferred embodiment of my invention, it will be readily understood by those skilled inthe art to which the same relates that various modifications may be made to suit particular 'or p eculiar requirements without departing from the spirit of my invention as defined in the appended claims.

' 'I-Iavingthus described my said invention, what I claimand'desire to secure by Letters Patent of the United States is:

1. In a device of the character described, the combination, with a body bifurcated to provide arms adapted to carry a pair of studs disposed in parallel spaced relation and a pair of circular cutters rotatably mounted upon said studs and having their cutting edges arranged in cooperative relation, of apair of guide rollers carried upon said arms and adapted to guide material into the path of said cutting edges.

2. In a device of the character described, the combination, with a body bifurcated to provide arms adapted to carry a pair of studs disposed in parallel spaced relation and a pair of circular cutters rotatably mounted upon said studs and having their cutting edges arranged in cooperative relation, of a pair of guide rollers carried upon said arms and adapted to guide material into the path of said cutting edges, one of said rollers being spring-mounted.

3. 'In a device of the character described, the

"combination, with a body bifurcated to provide arms adapted to carry a pair of studs disposed in parallel spaced relation and a pair of circular cutters rotatably mounted upon said studs and having their cutting edges arranged in cooperative relation, of a fixed stud upon the lower of said arms carrying a roller, a lever swingably,

mounted upon the upper of said arms, a stud upon the free end of said lever,-a roller upon said stud, and spring means adapted to yieldihgly urge said last mentioned roller towards said first mentioned roller, whereby the material to be'cut is directed towards said cutters.

' JOHN ANGEL. 

